Ray --
not a bad idea, doesn't sound to energy-efficient though, lasers, optical, magnetic, all the non-contact technologies are comig along steadily, in terms of non-invasive flow measurement. Last thing the world needs is another flowmeter, also, there are thousands of designs and embodiments...
Ray, you might look at the small excellent meter from Belgium, avaialable in the USA at:
http://www.measureanything.com/products/44907-2284/datasheet_44907-2284_DFS2W_disposable.asp
excerpt:
The DFS-2W has a linear flow range of 0.07– 4.5 l/m (.02–1.2GPM), turndown of 64:1, resolution of 60,000...
Marine LPG-petrol-gas Detectors - Facts and Figures
by Bert van der Berg, founder, Cruzpro, New Zealand
(submitted by www.Exomarine.com)
Liquefied Petroleum Gas (LPG) and gasoline vapors are heavier than air and will settle in the lowest areas of your boat - usually the bilges. At...
Glossary of Terms used in Infrared Non-contact Temperature Measurement
This glossary of terms provided by www.Raytek.com defines vocabulary and nomenclature commonly used within the infrared temperature measurement industry.
Absolute Zero The temperature of ¡273.16¦ C, ¡459.69¦ F, or...